reduce background noise for analog voice in cisco router

[Newone]

Hi all,

Need some advise whether cisco router (command) able to reduce background noise that appear on analog voice communication. Analog voice connection via fxs (routerA) to fxs (routerB). 

[George Sotiropoulos]

Hello,

You may find the following information useful for troubleshooting:

https://www.cisco.com/c/en/us/support/docs/voice/analog-signaling-e-m-did-fxs-fxo/214636-troubleshoot-and-monitor-analog-ports.html

George

[davisjaron]

What kind of background noise are you getting?  

If it's people talking and actual noises in the background, that has more to do with the microphone on the device that you're using. 

If it's something like static, then it may be a faulty device or connection somewhere along the path between the device and the FXS port. 

If you're hearing a humming noise, you may be running power parallel with your analog line.

[Newone]

Further check, find out the got parallel connection physically. Analog call from one source (X) is to reach for two destination (A and B). Analog call from source A to destination X only. Analog call from source B to destination X only. Call able to establish got humming noise. Can we do something at router configuration to reduce humming noise?